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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2047fbc7d097d862651377c14429b1c67f7c8caa55fb8aa351927a0dba51e3' 
  AND token = 'ZpWoaigNOwlD2o3wlN9uWffTdwz/G/YYDE6pqKUplNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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