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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87482be88a3021d9220c84d978f54a5618bb296d8244e4c33c3f7a7a99efc02e' 
  AND token = 'Rpn8JVyouyZkdSYndIPVTRW1Iw0DhmOQ6yoPv6VUSK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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