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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10b16508f9052331b504db7ac6900325572fdba51e2412e01adcf8dec31baae' 
  AND token = '4iHO8cmleyK4LaDTqT/Z2md89EYefcv3Qdaw+MOFQtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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