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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2415f8a03b8dcd1dc3bd41d5107428dcecfd765d357d33e0dec4089cdb9968' 
  AND token = 'K6NzGqHCQHBM6505aWCWEv4bCB1WOypou5/fpYRDU7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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