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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c2f90e3c9184287439efca1024dc1e41d97073f106e2c183d4b232de1b6d94' 
  AND token = 'H1NIuiBBA9yEHx3RBGDm7Ko7ZeFaXN+VnvxmuU5Gb6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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