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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98c3140f70b129d0c6adcb51355f90c5f782f5b3fcec4aeae5cfa4da6454499' 
  AND token = 'UUWf8xJibUp9oaCN2O9L6R4nTJi0Fn4Do5wd3vi3E+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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