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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ee38ac256d193a4672ad59735e6990e30600a2d79a53d0768c5a83261f11b8' 
  AND token = 'veXMUGopSNtgBacXIEKB7I/mSnvOX53ChTp3KjbmLUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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