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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5dcac5c4b9260880aaf476fa0446d018acc29500d5336a555b76d421e62d30' 
  AND token = 'Z4HLoxQbyvfbHElO8D1Xtd38vB2+UiVjy8Qj1TQ5Pt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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