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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54992f45ab7e0b20552f38fbacf4a9b2b5b4f8d701ea0dfb6d2dd03994c241f1' 
  AND token = 'Ib6YLoVOkUVLrNPJMgfeNwpA2OBEtNYZ93Fv/taFDvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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