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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08680dedeab68c588970b64077b465ddb92e42503a7038ffd55c6a28d5371f5e' 
  AND token = '4KcDSYP4923tZ2ucPW7H+LjHiogq0dWIcYGPyTbn2Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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