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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc4a50f9dd314a6ea9366637978976715e47885569bd895463778b6ead15556' 
  AND token = 'Pz49O4cpLWbcfgMTLEZFu6lA9sMq7cSRTUSEBP0zKJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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