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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f3e6d6ac6472dc19c305a45dc10dd6580a5722d62806e2becbfb6aa9d6901d' 
  AND token = '1kWPUqwI8yLfG6Z3L0JYCv4nH5FQfXAFQmNP07IbZFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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