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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86ae03b8cc97f3c3e9c5f9701373ab714821c47021784f1efe1449d1845bb5d' 
  AND token = 'ik1LHyfH1Bml0IJmf7sF5StucSSmte+iLtZaTo6umvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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