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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824faf9860ae6d8f4a1a289dda4ac47d02994770cbeead2d427e573f680e21c9' 
  AND token = 'z4jgmgdp7bHvohL2syL0AT7ZGoLzP9Xjo4/KU/zfkMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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