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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9e3bcff9290e46bddab660ff844f9d47295c11ee979df09c32bcb658de776e' 
  AND token = 'Nndt6FcaAJbu8hO6pQprAkauf+rTFD/jTFbMtQkVlZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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