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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766b1f276876268e462b47907d44e9031297a915d7f4a064884e52674b0f271d' 
  AND token = 'ZCJkoY0vHgXCH2Zrbwu3mMeT5ZQ40lsCMxSML65TAts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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