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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1563cf7554dca7b2bff06226e10a0558545e791b6de21fa701e56cbdd2cb539e' 
  AND token = 'SNK19TqS4RWq6qdLfUS8q8P3mJ85lGOdUo3us3wOafI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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