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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32543779a1b87a2438a1de26912589fd21ef2d7740d80a5308a4662a4e95b511' 
  AND token = '88IwKLI/YPWfltpkIkFFPZFM07e/2VYpKVucB2L7FUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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