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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08aa2519ab3a63eda377ebf3e27baa2fc0c1381e464bdf670db9b0c077ffe7f' 
  AND token = 'Eto5Rh2pbNdE8+S/CF/SBGwetfS2+T5J92rW9/2CO2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}