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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'decd6b425d736396ed54406ed8b840ee0385bac73e85247745d162cf4c1e707b' 
  AND token = '6oH4VXBwrfuG0OyKwbyJetcQdDY/h30b5NYCGvcI7LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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