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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af36157aa03dbc2028808556e0cea690b79746fbf1a5a526fe7db5a2659f632' 
  AND token = 'g55bDiMUUXJ1Ur260oqt83Aod8Be6X5pLL7oTVb+Yx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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