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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7edba776d79894e526e7009eb8722980658750ebe0f2e866034252704428b3c' 
  AND token = '3pPJdAZH3WWawhK8lNvkR/sRDClLDu/d7sXXBOekn5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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