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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903841dfd45ae4340e39a2c4b493439a48613000bf9458c4612b445f2865fa68' 
  AND token = 'MWIeJcrlUJoqfeK8LEG5wzBVXpHpGYzI00jVOiwA0Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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