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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ab9bb79a7e528ee037ad31d160587fb3b2dcf24e9b9c44952b61e6e89a0541' 
  AND token = '4e62NVVqD8NKPAgCRJvxlwD6K5jOJothFqPi5Q6V6m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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