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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbd97498c2ebc1320a74bcf94d3486a96c72ca575303b3a7fbd6065f6c5ba5b' 
  AND token = 'S2whY4cy+qO5AGNWqlTWThFFXQLWJBwfUWUM7WnA79o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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