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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fa08b54b6ac87520512d5cd37ae8e875e32b628117ad1d0776fb609671555d' 
  AND token = '8Y9LLOHE1VQs9lOIh6k1KdPO21KRgD5NptKjGq5jwsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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