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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd7ec325168c2820013db0ae003f84f3ae70f77ffa9f612b1e822d1e61107ed' 
  AND token = '8oAGFklqSLfwY6VSX0E66oDDh9feakx1HH8inlK2bOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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