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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80f6cef4edb10d03b9750cbe3aa4b817c4744ef3178c4f28322b3a4eedf3f957' 
  AND token = '5ekcN5ePsV906FYWZcTwYKeuAgSC3CcSd8jmCycu1ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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