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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4d0171981b92a61d7b1765c81f53bbe6610a7a02cc4c2e02fa1007c31595ec' 
  AND token = 'KhmWz2qsqTwTCIbIbeOl5KRbhtalurYI1MlKc+gg0eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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