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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6839aec75451e3dd26a1422c768cc0510bfe59061f77cc0cd67cf3bd47211d8e' 
  AND token = '+CLDWAEYJjKpIRJ8szt4HsWN2yNUkCbF1cxOMfekKvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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