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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '601d4408bc1d393f0d6fb6c5eda0a2ec72cac90e87265b2d799d571ff1013b59' 
  AND token = 'kd91y0ihkxGZV23gZnofGmdQdJwBpz6zyNiSzTZjc3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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