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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3296d274196e10dab4c5fe500c7950280c8ffd48fcc5c9bbf081b878314a4e9' 
  AND token = 'RG8g+Lyv6s00JGb6yW607u7Q/GU/O/YvzB9PfkH6OdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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