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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255cc142516f206cd1bc260509af80719fba304d8814d2ac8b4b75682d9a6d9d' 
  AND token = 'Oe5dmVOY64vVN47HMAnmrKEDL8MSqd8dxeW70Vr1ABs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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