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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879b502ebf31b4fb9ea0f40e63625e79f83967c6e2d304048dc121cc42691d71' 
  AND token = '3b61fIBUX4YnE+KvjlBMabez5wzzWrlBxwwtt3ZHAeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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