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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a527cf5ca6d1174517a772ef763fd395a9870473de2356bed0adc338babd808' 
  AND token = '9q6fkE4aDM6r9Pwau/uj21Q/z/bCNJ0oEi2UkaLfZSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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