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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c764bb5638237a2c4cf8a645e1d146b5e6c0c8ac50bcc53f4b6593517a627ee6' 
  AND token = 'X06sSjltY/4Lu+9SSFuawkjVHRaiMAVORcTzE9jSaJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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