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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd472ed7bd17a15488f33f5b11a2693bf4a5c9021640b8195fcab9f8a22ea6e5a' 
  AND token = 'CtSI+bqHz32tALGib1dRI7bNKQpQqLFj0Mbu+0U6HTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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