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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e557f6baea1f2d30b489b98a49098f83bfae35087915fd1c2f36706553d9b333' 
  AND token = 'Zh0eSXanRjtMCSqLzIIEQ7epISjv8Z1M1z3zbdnMdbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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