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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5adfe374b73626ee633bea18cec5b6c3132fb79ca5da037c716fa7432a5a83' 
  AND token = 'R165q//Y5LlmUI5WhGiA0BPQLpoVqgXboXmNUAfg3wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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