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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6b70c286ba4dd4f37fb11f22d583843a3db0d83abad20f755c8a260df7e65f1' 
  AND token = 'bSK1sEDLj+Xc2yelHK/mtR116pjIxJqT93rVo5SSKCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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