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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbf9858ed137ea603df99a8a121497e0e51653870e6c93960422b9a1a78f83f' 
  AND token = 'OTLiSC8XOnCJQy9X0uVPWiJv3U7ekzVc9OE4eh0pf1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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