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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f97a23c34c0d87485a626d288535a5a57770c30c451c5d99047500123d0f9d' 
  AND token = 'm1I4jLi6OBwFPqPobocdwmkQKrQ9ePzrsIAHu/LlBOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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