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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c460963a239ce9f0331043514cec25ed340e893425078384942ccaddd9e3f3' 
  AND token = 'BbudpKCfxM+ABD40bIIFYyc47kanRE3mFFqMGjAKu3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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