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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945f6751c488290cd808b5bd62bdfa69c7e40ee70632c8f166dee8ac61f2e310' 
  AND token = 'kt3PGk6E4J5hgvtNhLzJiTkAAcDKMDzF6+S6779UqTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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