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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfbcfa44ca5a7cd491e570e92c41832c891af2d4cc99febaefef00beaef296fd' 
  AND token = 'Gf2DVXYbl/Eeh3IhI0E+VD/X60WOQZst5BK2cN/qoPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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