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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207c63d0ee1f1079f9bb175d39ac378b12e52de47ce3c6dcdc15fd15c42f54bc' 
  AND token = 'C+dSw9kuVhKUvZ/Zfeho3DOHOpSM4Sq0DJn0Kk/4dTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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