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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de6562f0683fc2095db4158abc0389c033b266177473c0bc805ddeae447690b' 
  AND token = 'aMgeGVNdl9hxNvfRhloXCycP//Fe8/pMZujdMWwhAFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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