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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5bfeb1f97953a8ea30b5ed4da60f1e6cbcd64255b0420c80db3ec2dc759b086' 
  AND token = 'aQBdtEIWn9A3PdmaBz4q5HsowT13Yz5i2KQiabhJFDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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