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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4783a92d3db8514b7d9083a5690a0cd93352781669d6e9f24da028c3325768d0' 
  AND token = 'MPfka6BGr4wDTyvbsv0THmMxiBMkyNiX0TI6nXmxoGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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