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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4aaf8de3483121807d5e34c5a81524d957863ce67c29190085e6d014e7a9280' 
  AND token = 'shslEk3TKeh83gcE1BaX6OpzS3bKvlKjQ+iY/A3B1ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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