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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ea3e9e5c00ad2c3f59875baa722a48b1dae1624f103f08a04309cf6eb0700f' 
  AND token = 'Crbd6VGHppGPujmMRYqxQ5NYCcP/t8UbXu/lXDR95C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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